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(FILES) - A file picture taken on August 16, 2012, Bobbi Kristina Brown arrives at Tri-Star Pictures' "Sparkle" premiere at Grauman's Chinese Theatre in Hollywood, California. Bobbi Kristina Brown passed away on July 26, 2015. The 22-year-old was found face down and unresponsive in her bathtub in her Atlanta, Georgia home on January 31. She was revived by emergency crews but lost significant brain function. AFP PHOTO / Frederic J. BROWN Image Credit: AFP

Atlanta: An autopsy will be needed to evaluate what led to the death of Bobbi Kristina Brown, daughter of singer Whitney Houston, authorities said Monday, the day after her death.

In a statement Monday morning, the Fulton County Medical Examiner’s Office says the time that elapsed from when she was found unresponsive in January until her death Sunday will “complicate” its effort to reconstruct events.

“Interpretation of autopsy findings and other information will also be challenging,” the medical examiner’s office said in the statement. “However, an autopsy could be helpful to address questions which may arise about the cause of her unresponsiveness and eventual death.”

Bobbi Kristina died Sunday at Peachtree Christian Hospice in Duluth, Georgia, about six months after she was found Jan. 31, face-down and unresponsive in a bathtub in her suburban Atlanta home. She was 22.

A police report described it as a drowning.

Bobbi Kristina was the only child of Houston and R&B singer Bobby Brown.

“Bobbi Kristina Brown passed away July, 26 2015, surrounded by her family. She is finally at peace in the arms of God. We want to again thank everyone for their tremendous amount of love and support during these last few months,” Kristen Foster, a representative for the Houston family said on Sunday.

She had been hospitalized for months in Atlanta - eventually being placed in hospice care - after being found in a manner grimly similar to the way her megastar mother died three years earlier.

Nick Gordon, who shared her home with her, said at the time it seemed Bobbi Kristina wasn’t breathing and lacked a pulse before help arrived.

“The Roswell Police Department continues its investigation into the circumstances preceding and surrounding the time of the original incident leading to her death,” the medical examiner said in Monday morning’s statement.

The medical examiner did not release a timeframe for the autopsy, but said additional lab testing might take several weeks.